U.S. patent number 9,855,959 [Application Number 14/787,025] was granted by the patent office on 2018-01-02 for railcar bogie.
This patent grant is currently assigned to KAWASAKI JUKOGYO KABUSHIKI KAISHA. The grantee listed for this patent is KAWASAKI JUKOGYO KABUSHIKI KAISHA. Invention is credited to Shunichi Nakao, Takehiro Nishimura.
United States Patent |
9,855,959 |
Nishimura , et al. |
January 2, 2018 |
Railcar bogie
Abstract
A railcar bogie includes: a bogie frame including a cross beam
and plate springs and being rotatable relative to a bolster in a
yawing direction, the cross beam extending in a car width
direction, the plate springs supporting both respective car width
direction end portions of the cross beam and extending in a car
longitudinal direction; and stoppers provided at the bogie frame
and configured to contact interference members to restrict a
rotation range of the bogie frame when the bogie frame rotates
relative to the bolster in the yawing direction, the interference
members being connected to the bolster. When the bogie frame is
located at a neutral position relative to the bolster in the yawing
direction, the stoppers are arranged at car width direction lateral
sides of the cross beam so as to overlap the cross beam in a side
view.
Inventors: |
Nishimura; Takehiro (Kobe,
JP), Nakao; Shunichi (Kobe, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
KAWASAKI JUKOGYO KABUSHIKI KAISHA |
Kobe-shi, Hyogo |
N/A |
JP |
|
|
Assignee: |
KAWASAKI JUKOGYO KABUSHIKI
KAISHA (Kobe-shi, JP)
|
Family
ID: |
51791377 |
Appl.
No.: |
14/787,025 |
Filed: |
April 14, 2014 |
PCT
Filed: |
April 14, 2014 |
PCT No.: |
PCT/JP2014/002104 |
371(c)(1),(2),(4) Date: |
October 26, 2015 |
PCT
Pub. No.: |
WO2014/174788 |
PCT
Pub. Date: |
October 30, 2014 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
|
US 20160075352 A1 |
Mar 17, 2016 |
|
Foreign Application Priority Data
|
|
|
|
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Apr 24, 2013 [JP] |
|
|
2013-091157 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B61F
5/16 (20130101); B61F 5/52 (20130101); B61F
5/302 (20130101); B61F 3/02 (20130101); B61F
5/14 (20130101) |
Current International
Class: |
B61F
5/16 (20060101); B61F 3/02 (20060101); B61F
5/30 (20060101); B61F 5/14 (20060101); B61F
5/52 (20060101) |
Field of
Search: |
;105/198.2,198.4,198.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
202186399 |
|
Apr 2012 |
|
CN |
|
H02-33167 |
|
Mar 1990 |
|
JP |
|
H04-45982 |
|
Oct 1992 |
|
JP |
|
H06-40051 |
|
Oct 1994 |
|
JP |
|
2002-046603 |
|
Feb 2002 |
|
JP |
|
2012-116279 |
|
Jun 2012 |
|
JP |
|
Other References
Jul. 8, 2014 International Search Report issued in International
Patent Application No. PCT/JP2014/002104. cited by applicant .
Oct. 27, 2015 International Preliminary Report on Patentability
issued in International Patent Application No. PCT/JP2014/002104.
cited by applicant .
Oct. 27, 2016 Office Action issued in Chinese Patent Application
No. 201480021403.2. cited by applicant.
|
Primary Examiner: Kuhfuss; Zachary L
Attorney, Agent or Firm: Oliff PLC
Claims
The invention claimed is:
1. A bogie for supporting a carbody of a railcar, the bogie
comprising: a bogie frame including a cross beam and side members
and being rotatable relative to the carbody in a yawing direction,
the cross beam extending in a car width direction, the side members
supporting both respective car width direction end portions of the
cross beam and extending in a car longitudinal direction; and a
stopper provided at the bogie frame and configured to contact an
interference member to restrict a rotation range of the bogie frame
when the bogie frame rotates relative to the carbody in the yawing
direction, the interference member being connected to the carbody,
wherein when the bogie frame is located at a neutral position
relative to the carbody in the yawing direction, the stopper is not
in contact with the interference member and is arranged at a ear
width direction lateral side of the cross beam so as to overlap the
cross beam in a side view.
2. The railcar bogie according to claim 1, wherein the side members
are plate springs which contact and support the respective ear
width direction end portions of the cross beam from below.
3. The railcar bogie according to claim 1, further comprising a
bolster which supports the carbody via air springs, wherein: the
bogie frame supports the bolster such that the bolster is rotatable
relative to the bogie frame in the yawing direction, and the
interference member is provided at the bolster.
4. The railcar bogie according to claim 3, wherein: a bracket, to
which a bolster anchor is attached, is provided at a car width
direction end portion of the bolster and projects downward from the
bolster, and the interference member is provided at a car width
direction inner side of the bracket.
5. A bogie for supporting a carbody of a railcar, the bogie
comprising: a bogie frame including a cross beam and side members
and being rotatable relative to the carbody in a yawing direction,
the cross beam extending in a car width direction, the side members
supporting both respective car width direction end portions of the
cross beam and extending in a car longitudinal direction; and a
stopper provided at the bogie frame and configured to contact an
interference member to restrict a rotation range of the bogie frame
when the bogie frame rotates relative to the carbody in the yawing
direction, the interference member being connected to the carbody,
wherein: when the bogie frame is located at a neutral position
relative to the carbody in the yawing direction, the stopper is
arranged at a car width direction lateral side of the cross beam so
as to overlap the cross beam in a side view; the stopper comprises
a plurality of stoppers; the interference member comprises a
plurality of interference members; the plurality of stoppers
includes a first stopper located at a first side in the car
longitudinal direction and a second stopper located at a second
side in the car longitudinal direction; the first stopper is
located above the second stopper; the plurality of interference
members includes a first interference member located at the first
side in the car longitudinal direction and a second interference
member located at the second side in the car longitudinal
direction; the first interference member is located under the
second interference member; the first stopper is located on a
trajectory of a movement of the second interference member relative
to the bogie frame, the trajectory being drawn when the bogie frame
rotates relative to the carbody toward a first rotation side; and
the second stopper is located on a trajectory of a movement of the
first interference member relative to the bogie frame, the
trajectory being drawn when the bogie frame rotates relative to the
carbody toward a second rotation side.
6. The railcar bogie according to claim 5, wherein the first
stopper is located above a trajectory of the movement of the first
interference member relative to the bogie frame so as to overlap
the trajectory in a plan view, the trajectory being drawn when the
bogie frame rotates relative to the carbody toward the first
rotation side or the second rotation side.
7. The railcar bogie according to claim 5, wherein the second
stopper is located under a trajectory of the movement of the second
interference member relative to the bogie frame so as to overlap
the trajectory in a plan view, the trajectory being drawn when the
bogie frame rotates relative to the carbody toward the first
rotation side or the second rotation side.
8. The railcar bogie according to claim 5, wherein when the bogie
frame is located at the neutral position relative to the carbody in
the yawing direction, the first stopper is located above the first
interference member so as to overlap the first interference member
in a plan view.
9. The railcar bogie according to claim 5, wherein the side members
are plate springs which contact and support the respective car
width direction end portions of the cross beam from below.
10. The railcar bogie according to according to claim 5, further
comprising a bolster which supports the carbody via air springs,
wherein: the bogie frame supports the bolster such that the bolster
is rotatable relative to the bogie frame in the yawing direction,
and the interference member is provided at the bolster.
11. The railcar bogie according to according to claim 10, wherein:
a bracket, to which a bolster anchor is attached, is provided at a
car width direction end portion of the bolster and projects
downward from the bolster, and the interference member is provided
at a car width direction inner side of the bracket.
Description
TECHNICAL FIELD
The present invention relates to a bogie supporting a carbody of a
railcar.
BACKGROUND ART
A bogie for supporting a carbody of a railcar and allowing the
railcar to travel along a rail is provided under a floor of the
carbody. One type of the bogie includes: a bolster attached to the
carbody; and a bogie frame supporting the bolster from below, and
the bogie frame rotates relative to the bolster in a yawing
direction when, for example, the railcar travels along a curved
line.
PTL 1 discloses a bogie configured such that: cushion rubber as a
stopper is attached to a cross beam of a bogie frame so as to be
located in a space between left and right side sills of the bogie
frame; and the cushion rubber contacts and interferes with a
traction beam to restrict the displacement of the traction beam in
a leftward/rightward direction.
CITATION LIST
Patent Literature
PTL 1: Japanese Examined Utility Model Application Publication No.
2-33167
SUMMARY OF INVENTION
Technical Problem
In the bogie configured such that the bogie frame rotates relative
to the bolster, the stopper which restricts a rotation range of the
bogie frame may be provided at the bogie frame. However, as in PTL
1, when the stopper (for example, the cushion rubber) is provided
in the space between the left and right side sills of the bogie, a
car width direction inner space of the bogie is occupied by the
stopper and the like, so that the degree of freedom of the layout
of the other parts is limited. The stopper may receive a contact
load generated by the interference of the stopper with an opponent
member (for example, the bolster), the stopper rotating relative to
the opponent member. Therefore, from the viewpoint of the balance
and strength of the bogie, there is still room for improvement
regarding the arrangement of the stopper.
An object of the present invention is to improve a space efficiency
of a bogie and compactly configure the bogie while maintaining
balance and strength of the bogie in a car longitudinal
direction.
Solution to Problem
A railcar bogie according to the present invention is a bogie
supporting a carbody of a railcar, the bogie including: a bogie
frame including a cross beam and side members and being rotatable
relative to the carbody in a yawing direction, the cross beam
extending in a car width direction, the side members supporting
both respective car width direction end portions of the cross beam
and extending in a car longitudinal direction; and a stopper
provided at the bogie frame and configured to contact an
interference member to restrict a rotation range of the bogie frame
when the bogie frame rotates relative to the carbody in the yawing
direction, the interference member being connected to the carbody,
when the bogie frame is located at a neutral position relative to
the carbody in the yawing direction, the stopper being arranged at
a car width direction lateral side of the cross beam so as to
overlap the cross beam in a side view.
According to the above configuration, since the stopper is arranged
at the car width direction lateral side of the cross beam, a car
width direction inner space of the bogie can be efficiently
utilized for the layout of the other parts. Therefore, the space
efficiency can be improved. In this configuration, the stopper is
arranged so as to overlap the cross beam in a side view. With this,
the stopper can be provided close to the cross beam located at a
center in the car longitudinal direction. Thus, the bogie can be
compactly configured while maintaining the balance and strength of
the bogie. For example, when fixing the stopper to the cross beam,
a portion from a contact surface of the stopper until the cross
beam can be prevented from becoming long in the car longitudinal
direction, and the requirement of the strength of the stopper can
be relaxed.
Advantageous Effects of Invention
As is clear from the above explanation, the present invention can
improve the space efficiency of the bogie and compactly configure
the bogie while maintaining the balance of the bogie in the car
longitudinal direction.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective view showing a railcar bogie according to a
first embodiment.
FIG. 2 is a plan view of the bogie shown in FIG. 1.
FIG. 3 is a perspective view showing a state where a bolster is
detached from the bogie shown in FIG. 1.
FIG. 4 is a plan view of the bogie shown in FIG. 3.
FIG. 5 is a perspective view of the bolster of FIG. 1 when viewed
from an obliquely lower side.
FIG. 6 is a bottom view of the bolster of FIG. 5 when viewed from
below.
FIG. 7 is a side view showing a state where bolster anchors and
brackets are detached from the bogie shown in FIG. 1.
FIG. 8 is a side view showing the railcar bogie according to a
second embodiment.
FIG. 9 is a plan view of the bogie shown in FIG. 8.
DESCRIPTION OF EMBODIMENTS
Hereinafter, embodiments will be explained in reference to the
drawings. In the following explanations, each of a direction in
which a railcar travels and a length direction in which a carbody
extends is defined as a car longitudinal direction, and a lateral
direction perpendicular to the car longitudinal direction is
defined as a car width direction (in the embodiments, the car
longitudinal direction is also referred to as a forward/rearward
direction, and the car width direction is also referred to as a
leftward/rightward direction). In the drawings, the same reference
signs are used for the same components.
First Embodiment
FIG. 1 is a perspective view showing a railcar bogie 1 according to
the first embodiment. FIG. 2 is a plan view of the bogie 1 shown in
FIG. 1. As shown in FIGS. 1 and 2, the railcar bogie 1 includes a
bolster 3 and a bogie frame 4. The bolster 3 is attached to a
carbody (not shown) via air springs 2 serving as secondary
suspensions and supports the carbody. The bogie frame 4 supports
the bolster 3 so as to be rotatable relative to the bolster 3 in a
yawing direction. The bolster 3 is located at a car longitudinal
direction middle portion of the bogie 1 and extends in the car
width direction. The air springs 2 are arranged at respective upper
surfaces of left and right end portions of the bolster 3. The bogie
frame 4 includes a cross beam 5 and plate springs 30 (side
members). The cross beam 5 extends in the car width direction that
is the leftward/rightward direction and supports the carbody. The
plate springs 30 (side members) support both respective car width
direction end portions of the cross beam 5 from below and extend in
the car longitudinal direction.
The cross beam 5 is turnably connected to the bolster 3 via a turn
guide mechanism 13. The bolster 3 is connected to the carbody (not
shown) via the air springs 2 and bolster anchors 12. In the present
embodiment, the turn guide mechanism 13 includes a concave portion
13a and a convex portion 13b. The concave portion 13a is formed on
an upper surface of a center portion of the cross beam 5, and the
convex portion 13b projects from a lower surface 3b of a center
portion of the bolster 3 and is rotatably fitted to the concave
portion 13a. A locking tool (for example, a locking pin) is
attached to the turn guide mechanism 13. The locking tool prevents
the convex portion 13b from being detached from the concave portion
13a in a vertical direction. Front and rear axles 6 extending along
the car width direction are arranged in front of and behind the
cross beam 5, respectively. Wheels 7 are fixed to both respective
car width direction sides of each axle 6. Bearings 8 are provided
at both respective car width direction end portions of each axle 6
so as to be located outside the wheels 7 in the car width
direction. The bearings 8 rotatably support the axles 6. The
bearings 8 are accommodated in respective axle boxes 9. Electric
motors 10 are attached to the cross beam 5, and reducers 11 which
transmit power to the respective axles 6 are connected to
respective output shafts of the electric motors 10.
Each of the plate springs 30 extending in the car longitudinal
direction is provided between the cross beam 5 and the axle box 9.
Longitudinal direction middle portions 30a (see FIG. 7) of the
plate springs 30 support both respective car width direction end
portions of the cross beam 5 from below. Both longitudinal
direction end portions 30b of each of the plate springs 30 are
supported by the respective axle boxes 9. To be specific, each of
the plate springs 30 serves as both a primary suspension and a
conventional side sill. The plate springs 30 are made of, for
example, fiber-reinforced resin, and the middle portions 30a (see
FIG. 7) of the plate springs 30 are arranged under the cross beam
5. Pressing members 31 (see FIG. 7) are provided under the
respective car width direction end portions of the cross beam 5.
Each of the pressing members 31 is provided between a pair of
receiving seats 17 and 18 and has a lower surface formed in a
circular-arc shape in a side view. The pressing members 31 are
disposed on the respective middle portions 30a of the plate springs
30 from above. To be specific, the pressing members 31 press
respective upper surfaces of the plate springs 30 downward by a
carbody load so as not to fix the plate springs 30 in an
upper/lower direction, the carbody load being transmitted from the
cross beam 5. The pressing member 31 is formed by a rigid member
(for example, metal or fiber-reinforced resin).
Spring seats 33 are attached to respective upper portions of the
axle boxes 9. The end portions 30b of the plate springs 30 are
disposed on the respective spring seats 33 from above. To be
specific, the end portions 30b of each of the plate springs 30 are
supported by the respective axle boxes 9 via the respective spring
seats 33. The spring seats 33 support both respective end portions
30b of each of the plate springs 30 such that upper surfaces of the
end portions 30b of each of the plate springs 30 are inclined in a
direction toward the middle portion 30a. The middle portion 30a of
the plate spring is pressed by the lower surface of the pressing
member 31 (see FIG. 7) to have a circular-arc shape. To be
specific, the middle portion 30a is located under the end portions
30b, and the entire plate spring 30 has a bow shape that is convex
downward in a side view.
The axle boxes 9 are coupled to the car width direction end
portions of the cross beam 5 by coupling devices 15 constituting
axle box suspensions. Each of the coupling devices 15 includes axle
beams 16, a pair of receiving seats 17 and 18, and coupling
portions 19. Each of the axle beams 16 projects integrally from the
axle box 9 toward the cross beam 5. The receiving seats 17 and 18
project from the cross beam 5 toward the axle beams 16. Each of the
coupling portions 19 includes a rubber bushing or the like (not
shown) and elastically couples a tip end portion 16a of the axle
beam 16 to the receiving seats 17 and 18 and To be specific, the
coupling device 15 of the present embodiment is an axle beam type
device.
FIG. 3 is a perspective view showing a state where the bolster 3 is
detached from the bogie 1 shown in FIG. 1. FIG. 4 is a plan view of
the bogie shown in FIG. 3. As shown in FIGS. 3 and 4, rubbing plate
units 35 are provided on respective upper surfaces of both car
width direction end portions of the cross beam 5 of the bogie frame
4. Each of the rubbing plate units 35 includes: a receiving member
36 fixed to an upper surface of the cross beam 5; and a rubbing
plate 37 accommodated in a concave portion formed on an upper
surface of the receiving member 36. The rubbing plate 37 projects
upward from the receiving member 36. In a plan view, the rubbing
plate 37 is arranged within a region where the cross beam 5 and the
plate spring 30 intersect with each other and is also arranged on a
center line of the plate spring 30, the center line extending in
the car longitudinal direction.
A first stopper 41A and a second stopper 45A are fixed to one of
the car width direction end portions of the cross beam 5. The first
stopper 41A restricts a rotation range of the bogie frame 4 when
the bogie frame 4 rotates relative to the bolster 3 toward a first
rotation side R1 of the yawing direction. The second stopper 45A
restricts the rotation range of the bogie frame 4 when the bogie
frame 4 rotates relative to the bolster 3 toward a second rotation
side R2 of the yawing direction. A third stopper 41B and a fourth
stopper 45B are fixed to the other car width direction end portion
of the cross beam 5. The fourth stopper 45B restricts the rotation
range of the bogie frame 4 when the bogie frame 4 rotates relative
to the bolster 3 toward the first rotation side R1 of the yawing
direction. The third stopper 41B restricts the rotation range of
the bogie frame 4 when the bogie frame 4 rotates relative to the
bolster 3 toward the second rotation side R2 of the yawing
direction.
Each of the first stopper 41A and the third stopper 41B projects
toward a car width direction outer side from a portion of the car
width direction end portion of the cross beam 5, the portion being
located at a first side in the car longitudinal direction. Each of
the second stopper 45A and the third stopper 45B projects toward
the car width direction outer side from a portion of the car width
direction end portion of the cross beam 5, the portion being
located at a second side in the car longitudinal direction. The
first stopper 41A and the third stopper 41B are arranged above the
second stopper 45A and the fourth stopper 45B. In a plan view, the
first to fourth stoppers 41A, 41B, 45A, and 45B are arranged within
a range of a car longitudinal direction length of the cross beam
5.
Each of the first stopper 41A and the third stopper 41B includes a
base portion 42 and a contact portion 43. The base portion 42
projects from the cross beam 5 toward the car width direction outer
side. The contact portion 43 is provided at the second side of the
base portion 42 in the car longitudinal direction and includes a
contact surface facing the second side in the car longitudinal
direction. Each of the second stopper 45A and the fourth stopper
45B includes a plate-shaped base portion 46 and a contact portion
47. The base portion 46 projects from the cross beam 5 toward the
car width direction outer side. The contact portion 47 is provided
at the first side of the base portion 46 in the car longitudinal
direction and includes a contact surface facing the first side in
the car longitudinal direction. Each of the contact surfaces of the
contact portions 43 and 47 is a surface perpendicular to a
horizontal direction. Each of the base portions 42 and 46 is a
horizontal plate projecting from the cross beam 5 toward the car
width direction outer side. Upper surfaces of the base portions 42
are flush with an upper surface of the cross beam 5, and lower
surfaces of the base portions 46 are flush with a lower surface of
the cross beam 5.
In a plan view, each of the contact surfaces of the contact
portions 43 of the first and third stoppers 41A and 41B is formed
so as to include a surface parallel to a virtual line inclined
toward one side at a predetermined angle .theta.1 relative to a
center line extending through a turning center O of the bogie frame
4 and parallel to the car width direction. In a plan view, each of
the contact surfaces of the contact portions 47 of the second and
fourth stoppers 45A and 45B is formed so as to include a surface
parallel to a virtual line inclined toward the other side at the
predetermined angle .theta.1 relative to the center line extending
through the turning center O of the bogie frame 4 and parallel to
the car width direction. To be specific, in a plan view, the
contact surfaces of the contact portions 43 and 47 of the first and
second stoppers 41A and 45A includes respective surfaces which are
inclined relative to the car width direction such that a distance
between these surfaces increases as the surfaces extend toward the
car width direction outer side. The contact surfaces of the contact
portions 43 and 47 of the third and fourth stoppers 41B and 45B are
similarly formed. At least the base portions 42 and 46 of the first
to fourth stoppers 41A, 41B, 45A, and 45B are made of a rigid
material, such as metal or fiber-reinforced resin. At least the
contact surfaces of the contact portions 43 and 47 may be made of
an elastic material, such as rubber.
FIG. 5 is a perspective view of the bolster 3 of FIG. 1 when viewed
from an obliquely lower side. FIG. 6 is a bottom view of the
bolster 3 of FIG. 5 when viewed from below. As shown in FIGS. 5 and
6, brackets 21 projecting downward are provided at both respective
car width direction end portions of the bolster 3. The bolster
anchors 12 which connect the carbody (not shown) with the bolster 3
are attached to the respective brackets 21. The bolster 3 includes
projecting portions 3a each projecting toward both sides in the car
longitudinal direction such that a lower surface of the bolster 3
partially expands in the car longitudinal direction at a position
opposing the rubbing plate 37 (see FIG. 3). Rubbed plates 23 are
attached to respective lower surfaces of both end portions of the
bolster 3. The rubbed plates 23 slidingly contact the respective
rubbing plates 37 (see FIG. 3).
A first interference member 51A and a second interference member
55A are provided at a car width direction inner side of the bracket
21 provided at one of car width direction sides of the bolster 3.
The first interference member 51A contacts the first stopper 41A to
restrict the rotation range of the bogie frame 4 when the bogie
frame 4 rotates relative to the bolster 3 toward the first rotation
side R1 of the yawing direction. The second interference member 55A
contacts the second stopper 45A to restrict the rotation range of
the bogie frame 4 when the bogie frame 4 rotates relative to the
bolster 3 toward the second rotation side R2 of the yawing
direction. A fourth interference member 55B and a third
interference member 51B are provided at a car width direction inner
side of the bracket 21 provided at the other car width direction
side of the bolster 3. The fourth interference member 55B contacts
the fourth stopper 45B to restrict the rotation range of the bogie
frame 4 when the bogie frame 4 rotates relative to the bolster 3
toward the first rotation side R1 of the yawing direction. The
third interference member 51B contacts the third stopper 41B to
restrict the rotation range of the bogie frame 4 when the bogie
frame 4 rotates relative to the bolster 3 toward the second
rotation side R2 of the yawing direction.
Each of the first interference member 51A and the third
interference member 51B projects toward the car width direction
inner side from a portion of the bracket 21 of the bolster 3, the
portion being located at the first side in the car longitudinal
direction. Each of the second interference member 55A and third
interference member 55B projects toward the car width direction
inner side from a portion of the bracket 21 of the bolster 3, the
portion being located at the second side in the car longitudinal
direction. The first interference member 51A and the third
interference member 51B are arranged under the second interference
member 55A and the fourth interference member 55B. In a plan view,
the first to fourth interference members 51A, 51B, 55A, and 55B are
arranged under the bolster 3 so as to overlap the bolster 3.
Each of the first interference member 51A and the third
interference member 51B includes a base portion 52 and a contact
portion 53. The base portion 52 projects from the bracket 21 toward
the car width direction inner side. The contact portion 53 is
provided at the second side of the base portion 52 in the car
longitudinal direction and includes a contact surface facing the
second side in the car longitudinal direction. Each of the second
interference member 55A and the fourth interference member 55B
includes a base portion 56 and a contact portion 57. The base
portion 56 projects from the bracket 21 toward the car width
direction inner side. The contact portion 57 is provided at the
first side of the base portion 56 in the car longitudinal direction
and includes a contact surface facing the first side in the car
longitudinal direction. Each of upper surfaces of the base portions
52 of the first and third interference members 51A and 51B includes
a horizontal surface. The base portions 52 of the first and third
interference members 51A and 51B are thicker than the base portions
56 of the second and fourth interference members 55A and 55B. Each
of the contact surfaces of the contact portions 53 and 57 is a
surface perpendicular to the horizontal direction. In a plan view,
each of the contact surfaces of the contact portions 53 of the
first and third interference members 51A and 51B is formed so as to
include a surface parallel to a virtual line inclined toward one
side at a predetermined angle .theta.2 relative to the center line
extending through the turning center O of the bogie frame 4 and
parallel to the car width direction. In a plan view, each of the
contact surfaces of the contact portions 57 of the second and
fourth interference members 55A and 55B is formed so as to include
a surface parallel to a virtual line inclined toward the other side
at the predetermined angle .theta.2 relative to the center line
extending through the turning center O of the bogie frame 4 and
parallel to the car width direction. The predetermined angle
.theta.2 may be the same as or different form the predetermined
angle .theta.1.
At least the base portions 52 and 56 of the first to fourth
interference members 51A, 51B, 55A, and 55B are made of a rigid
material, such as metal or fiber-reinforced resin. It is preferable
that at least the contact surfaces of the contact portions 53 and
57 of the first to fourth interference members 51A, 51B, 55A, and
55B be made of an elastic material, such as rubber. However, the
contact surfaces of the contact portions 53 and 57 of the first to
fourth interference members 51A, 51B, 55A, and 55B may be made of a
rigid material. To be specific, at least one of a group of the
contact surfaces of the first to fourth stoppers 41A, 41B, 45A, and
45B and a group of the contact surfaces of the first to fourth
interference members 51A, 51B, 55A, and 55B may be made of the
elastic material. The configuration and arrangement of the first to
fourth stoppers 41A, 41B, 45A, and 45B and the configuration and
arrangement of the first to fourth interference members 51A, 51B,
55A, and 55B may be replaced with each other.
FIG. 7 is a side view showing a state where the bolster anchors 12
and the brackets 21 are detached from the bogie shown in FIG. 1. As
shown in FIG. 7, the pressing members 31 are provided on respective
lower surfaces of both car width direction end portions of the
cross beam 5. Each of the pressing members 31 is placed on the car
longitudinal direction middle portion 30a of the plate springs 30
from above. The pressing member 31 does not support the lower
surface of the plate spring 30, that is, the lower surface of the
plate spring 30 is in an exposed state. In other words, the
pressing member 31 is not fixed to the plate spring 30 in the
upper/lower direction and presses the upper surface of the plate
spring 30 downward so as to be separable from the upper surface of
the plate spring 30. To be specific, the pressing of the pressing
member 31 against the upper surface of the plate spring 30 is
maintained by weight loads of the carbody (not shown), the bolster
3, the cross beam 5, and the like. When viewed from a lateral
direction that is a direction (car width direction) perpendicular
to the longitudinal direction of the plate spring 30, the lower
surface of the pressing member 31 has a circular-arc shape that is
convex downward, the lower surface pressing the plate spring 30.
Similarly, when viewed from the lateral direction that is the
direction (car width direction) perpendicular to the longitudinal
direction of the plate spring 30, an upper surface of the middle
portion 30a has a circular-arc shape that is convex downward, the
upper surface being pressed by the pressing member 31.
The first stopper 41A is located on a trajectory of the movement of
the second interference member 55A relative to the bogie frame 4,
the trajectory being drawn when the bogie frame 4 rotates relative
to the bolster 3 toward the first rotation side R1. The second
stopper 45A is located on a trajectory of the movement of the first
interference member 51A relative to the bogie frame 4, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the second rotation side R2. The third stopper
41B is located on a trajectory of the movement of the fourth
interference member 55B relative to the bogie frame 4, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the second rotation side R2. The fourth
stopper 45B is located on a trajectory of the movement of the third
interference member 51B relative to the bogie frame 4, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the first rotation side R1.
The first stopper 41A is located above a trajectory of the movement
of the first interference member 51A relative to the bogie frame 4
so as to overlap the trajectory in a plan view, the trajectory
being drawn when the bogie frame 4 rotates relative to the bolster
3 toward the first rotation side or the second rotation side. The
second stopper 45A is located under a trajectory of the movement of
the second interference member 55A relative to the bogie frame 4 so
as to overlap the trajectory in a plan view, the trajectory being
drawn when the bogie frame 4 rotates relative to the bolster 3
toward the first rotation side or the second rotation side. The
third stopper 41B is located above a trajectory of the movement of
the third interference member 51B relative to the bogie frame 4 so
as to overlap the trajectory in a plan view, the trajectory being
drawn when the bogie frame 4 rotates relative to the bolster 3
toward the first rotation side or the second rotation side. The
fourth stopper 45B is located under a trajectory of the movement of
the fourth interference member 55B relative to the bogie frame 4 so
as to overlap the trajectory in a plan view, the trajectory being
drawn when the bogie frame 4 rotates relative to the bolster 3
toward the first rotation side or the second rotation side.
At least the contact surfaces of the contact portions 43 and 47 of
the first to fourth stoppers 41A, 41B, 45A, and 45B are arranged at
a car width direction lateral side of the cross beam 5 so as to
overlap the cross beam 5 in a side view. In the present embodiment,
the base portions 42 and 46 and contact portions 43 and 47 of the
first to fourth stoppers 41A, 41B, 45A, and 45B are arranged so as
to overlap the cross beam 5 in a side view.
At least the contact surfaces of the contact portions 53 and 57 of
the first to fourth interference members 51A, 51B, 55A, and 55B are
arranged at a car width direction lateral side of the cross beam 5
so as to overlap the cross beam 5 in a side view when the bogie
frame 4 is in a neutral state, that is, when the bogie frame 4 is
located at a neutral position in the yawing direction relative to
the bolster 3. In the present embodiment, the base portions 52 and
56 and contact portions 53 and 57 of the first to fourth
interference members 51A, 51B, 55A, and 55B are arranged so as to
overlap the cross beam 5 in a side view in the neutral state. The
first stopper 41A is located above the first interference member
51A so as to overlap the first interference member 51A in a plan
view in the neutral state, and the third stopper 41B is located
above the third interference member 51B so as to overlap the third
interference member 51B in a plan view in the neutral state. The
neutral state denotes a state where a horizontal line perpendicular
to a length direction of the cross beam 5 becomes parallel to the
car longitudinal direction. In the present embodiment, the neutral
state denotes a state where the length direction of the cross beam
5 and a length direction of the bolster 3 become parallel to each
other.
According to the configuration explained above, when the bogie
frame 4 rotates relative to the bolster 3 in the yawing direction
to reach a predetermined rotation angle, the rotation range of the
bogie frame 4 is appropriately restricted by the stoppers fixed to
the bogie frame 4 and the interference members fixed to the bolster
3. More specifically, as shown in FIGS. 4 and 6, when the bogie
frame 4 rotates relative to the bolster 3 toward the first rotation
side R1 to reach the predetermined rotation angle, the first
stopper 41A and the second interference member 55A contact each
other, and at the same time, the fourth stopper 45B and the third
interference member 51B contact each other. In contrast, when the
bogie frame 4 rotates relative to the bolster 3 toward the second
rotation side R2 to reach the predetermined rotation angle, the
second stopper 45A and the first interference member 51A contact
each other, and at the same time, the third stopper 41B and the
fourth interference member 55B contact each other. As above, when
the bogie frame 4 rotates toward any side, the rotation range can
be appropriately restricted. Since the first to fourth stoppers
41A, 41B, 45A, and 45B are arranged at the car width direction
lateral sides of the cross beam 5, a car width direction inner
space of the bogie 1 can be efficiently utilized for the layout of
the other parts. Therefore, the space efficiency can be improved.
In this configuration, the first to fourth stoppers 41A, 41B, 45A,
and 45B are arranged so as to overlap the cross beam 5 in a side
view. With this, the first to fourth stoppers 41A, 41B, 45A, and
45B can be provided close to the cross beam 5 located at a center
in the car longitudinal direction. Thus, the bogie 1 can be
compactly configured while maintaining the balance and strength of
the bogie 1. In the present embodiment, the base portions 42 and 46
each of which connects the cross beam 5 to the contact portion 43
or 47 can be prevented from becoming long in the car longitudinal
direction, and the requirement of the strength of each of the first
to fourth stoppers 41A, 41B, 45A, and 45B can be relaxed.
The first stopper 41A is located above the trajectory of the
movement of the first interference member 51A relative to the bogie
frame 4 so as to overlap the trajectory in a plan view, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the first rotation side or the second rotation
side. The third stopper 41B is located above the trajectory of the
movement of the third interference member 51B relative to the bogie
frame 4 so as to overlap the trajectory in a plan view, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the first rotation side or the second rotation
side. The second stopper 45A is located under the trajectory of the
movement of the second interference member 55A relative to the
bogie frame 4 so as to overlap the trajectory in a plan view, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the first rotation side or the second rotation
side. The fourth stopper 45B is located under the trajectory of the
movement of the fourth interference member 55B relative to the
bogie frame 4 so as to overlap the trajectory in a plan view, the
trajectory being drawn when the bogie frame 4 rotates relative to
the bolster 3 toward the first rotation side or the second rotation
side. To be specific, a group of the first stopper 41A and the
second interference member 55A and a group of the second stopper
45A and the first interference member 51A are arranged so as to be
lined up in an upper/lower direction, and a group of the third
stopper 41B and the fourth interference member 55B and a group of
the fourth stopper 45B and the third interference member 51B are
arranged so as to be lined up in the upper/lower direction.
Therefore, while preventing these groups from occupying a large
space in the car longitudinal direction, an allowable rotation
range of the bogie frame 4 relative to the bolster 3 can be made
adequately large. For example, in the present embodiment, an
allowable rotation angle .theta. of the bogie frame 4 relative to
the bolster 3 based on the neutral state is represented by
.theta.1+.theta.2. To be specific, an entire allowable rotation
angle from a rotation limit at the first rotation side until a
rotation limit at the second rotation side is represented by
2.theta. (=2(.theta.1+.theta.2)). Further, when the bogie frame 4
is in the neutral state, that is, when the bogie frame 4 is located
at the neutral position relative to the bolster 3 in the yawing
direction, the first stopper 41A is located above the first
interference member 51A so as to overlap the first interference
member 51A in a plan view, and the third stopper 41B is located
above the third interference member 51B so as to overlap the third
interference member 51B in a plan view. Therefore, even if the
bogie frame 4 is about to fall off from the bolster 3 when the
bogie 1 is suspended by lifting up the bolster 3, the first
interference member 51A and the third interference member 51B can
receive the first stopper 41A and the third stopper 41B from
below.
Second Embodiment
FIG. 8 is a side view showing a railcar bogie 101 according to the
second embodiment. FIG. 9 is a plan view of the bogie 101 shown in
FIG. 8. As shown in FIGS. 8 and 9, the bogie 101 of the second
embodiment does not include the plate springs 30 as the side
members. A bogie frame 104 of the second embodiment includes a pair
of side sills 130 (side members) and a cross beam 105. The side
sills 130 are located at both respective car width direction sides
of the bogie frame 104 and extend in the car longitudinal
direction. The cross beam 105 extends in the car width direction so
as to couple car longitudinal direction middle portions, that is,
forward/rearward direction middle portions of the side sills 130 to
each other. The side sills 130 are fixed to the cross beam 105 by
welding or the like, and the entire bogie frame 104 has an H shape
in a plan view.
An axle box suspension 133 constituted by a coil spring (axle
spring) is interposed between a car longitudinal direction end
portion 130b of the side sill 130 and the axle box 9. An axle beam
116 extends integrally from the axle box 9 in the forward/rearward
direction toward a center of the bogie. An end portion of the axle
beam 116 is elastically coupled to the side sill 130 via a rubber
bushing or the like. To be specific, the bogie 101 includes a
so-called axle beam type axle box suspension. It should be noted
that the axle box suspension may be an axle box suspension other
than the axle beam type axle box suspension.
The first stopper 41A and the second stopper 45A are fixed at one
of both car width direction sides to a region of the side sill 130
by welding or the like, the region overlapping the cross beam 105
in a side view. The first stopper 41A and the second stopper 45A
according to the present embodiment are the same in the
configuration and the positional relation as those according to the
first embodiment. Therefore, the same reference signs are used. In
a plan view, the first stopper 41A and the second stopper 45A are
arranged within the range of the car longitudinal direction length
of the cross beam 105. Similarly, the third stopper 45A and the
fourth stopper 45B are fixed at the other car width direction side
and are the same in the configuration and the positional relation
as those according to the first embodiment. Although not shown, the
bogie frame 104 supports the bolster 3 from below, the bolster 3
being the same as that of the first embodiment. The other
components are the same as those of the first embodiment.
Therefore, for example, the same reference signs are used for the
same components, and detailed explanations thereof are omitted.
The present invention is not limited to the above embodiments, and
modifications, additions, and eliminations may be made within the
scope of the present invention. The above embodiments may be
combined arbitrarily. For example, a part of components or methods
in one embodiment may be applied to another embodiment.
For example, the above embodiment includes the first to fourth
stoppers 41A, 41B, 45A, and 45B and the first to fourth
interference members 51A, 51B, 55A, and 55B. However, any of the
stoppers and the interference members which simultaneously contact
each other at the first and second rotation sides R1 and R2 may be
omitted. To be specific, the fourth stopper 45B and the third
interference member 51B may be omitted. In such a case, at the
first rotation side R1, the rotation range of the bogie frame 4 is
restricted by the first stopper 41A and the second interference
member 55A. Similarly, the first stopper 41A and the second
interference member 55A may be omitted. In such a case, at the
first rotation side R1, the rotation range of the bogie frame 4 is
restricted by the fourth stopper 45B and the third interference
member 41B. Similarly, at the second rotation side R2, any one of
the group of the stopper and the interference member at one of both
car width direction sides and the group of the stopper and the
interference member at the other car width direction side may be
omitted.
INDUSTRIAL APPLICABILITY
As above, the railcar bogie according to the present invention
includes the above excellent effects. It is useful to widely apply
the present invention to railcar bogies which can achieve the
significance of the above effects.
REFERENCE SIGNS LIST
1, 101 bogie
3 bolster
4, 104 bogie frame
5, 105 cross beam
30 plate spring (side member)
41A first stopper
45A second stopper
41B third stopper
45B fourth stopper
51A first interference member
55A second interference member
51B third interference member
55B fourth interference member
130 side sill (side member)
* * * * *